I don't find the manga's that are too cute-sy to be drawn well. I don't know, they're just not attractive to me :/
I would say that manga's like Amatsuki, Bleach & Karneval are drawn perfectly though. n__n

Ah, I couldn't help but not post something XD. I had to sort down some of my favorites. (had to go through my bookmarks ;p). I prefer ether a refreshing style or a realistic one. Here are the top five that I can remember but there are plenty more ^^;; (they are not in order)

Natsume Yujinchou (and anything else of the same mangaka, I lover her works)
Until death do Us Part
Amatsuki
Dengeki Daisy
and
Hi no Matoi<-- a new manga but it's really good